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      bootstrap-fileinput组件在上传时传递额外参数
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	Posted on <a href="/2016/11/23/bootstrap-fileinput-uploadExtraData/" class="article-date">
	  <time datetime="2016-11-23T12:54:46.000Z" itemprop="datePublished">November 23, 2016</time>
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        <blockquote>
<p>该问题的使用场景是：在微信平台素材上传的页面使用，在上传时需要发送一个参数，让后台判断是临时素材还是永久素材。 但是该组件在一开始就已经初始化(问题所在)了要发送的参数，也就是说没有办法后期追加额外的参数。</p>
</blockquote>
<p>　　由于英文水平问题，阅读官方文档时没有找到该问题的解决方法，于是去github提了一个<a href="https://github.com/kartik-v/bootstrap-fileinput/issues/795" target="_blank" rel="noopener">issue</a> ，得到的答案是仔细阅读文档，里面有一个回调函数可以解决问题😍<br><a id="more"></a></p>
<h3 id="解决方法"><a href="#解决方法" class="headerlink" title="解决方法"></a>解决方法</h3><p>　　关键的配置参数是<a href="http://plugins.krajee.com/file-input#option-uploadextradata" target="_blank" rel="noopener">uploadExtraData</a><br>　　具体的代码如下：<br><figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//获得额外参数的方法</span></span><br><span class="line">fodderType = <span class="function"><span class="keyword">function</span>(<span class="params"></span>) </span>&#123;</span><br><span class="line">        <span class="keyword">return</span> $(<span class="string">"#fodderTypeSelect"</span>).val();</span><br><span class="line">    &#125;;</span><br><span class="line">　　        </span><br><span class="line"><span class="comment">//初始化fileinput控件（第一次初始化）</span></span><br><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">initFileInput</span>(<span class="params">ctrlName, FileExtensions, fileSize</span>) </span>&#123;</span><br><span class="line">        <span class="keyword">var</span> control = $(<span class="string">'#'</span> + ctrlName);</span><br><span class="line"></span><br><span class="line">        control.fileinput(&#123;</span><br><span class="line">            language: <span class="string">'zh'</span>, <span class="comment">//设置语言</span></span><br><span class="line">            uploadUrl: <span class="string">"/WxMedia/ImageUpload"</span>, <span class="comment">//上传的地址</span></span><br><span class="line">            allowedFileExtensions: FileExtensions, <span class="comment">//接收的文件后缀</span></span><br><span class="line">            showUpload: <span class="literal">true</span>, <span class="comment">//是否显示上传按钮</span></span><br><span class="line">            showCaption: <span class="literal">true</span>, <span class="comment">//是否显示标题,</span></span><br><span class="line">            maxFileSize: fileSize * <span class="number">1000</span>, <span class="comment">//单位为kb，如果为0表示不限制文件大小</span></span><br><span class="line">            browseClass: <span class="string">"btn btn-primary"</span>, <span class="comment">//按钮样式</span></span><br><span class="line">            previewFileIcon: <span class="string">"&lt;i class='glyphicon glyphicon-king'&gt;&lt;/i&gt;"</span>,</span><br><span class="line">            initialCaption: <span class="string">"请选择上传素材"</span>,</span><br><span class="line">            uploadExtraData: <span class="function"><span class="keyword">function</span>(<span class="params">previewId, index</span>) </span>&#123;   <span class="comment">//额外参数的关键点</span></span><br><span class="line">                <span class="keyword">var</span> obj = &#123;&#125;;</span><br><span class="line">                obj.fodder = fodderType();</span><br><span class="line">                <span class="built_in">console</span>.log(obj);</span><br><span class="line">                <span class="keyword">return</span> obj;</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;);</span><br><span class="line">    &#125;</span><br></pre></td></tr></table></figure></p>
<h3 id="关键点："><a href="#关键点：" class="headerlink" title="关键点："></a>关键点：</h3><p>　　可以看到配置文件中<code>uploadExtraData</code>的参数是一个函数形式，这是一个回调函数，会在上传时调用，读取配置的额外参数。</p>

      
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